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Old Sep 9, 2025 | 05:43 PM
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From: abingdon maryland
Default Help with wiring





I just bought a dual fan spal dewitt fans to go with my cut down dewitt radiator. I went Ls 3 after my supercharged ls 6 granaded again. When I got the car back, it was over heating b/c I am not sure I had the proper radiator shrouding. The single 16" fan was just stuck on the back of the radiator and the rest of the radiator was left exposed. I will Going from single 16 " without a proper shroud to dewitt duals. It seems like it has a nice aluminum covering to protect the radiator from heat. Can you help me verify the 4 wires. I have a darkblue and white and black and gray going to the single plug. Everyghing in the fuse box is the same. Does the darkblue and white connect to the left fan which will in turn run in series and turn the rt fan when needed. Does the black and gray wire go to the right fan. It looks like they took the 4 wires from the c5 connectors and joined them into two wires going to the single radiator.

My other problem is the oem plugs that I bought both are black wires. If I connect them wrong , it will push vs pull when the fans are operating. I guess I can always reverse it. Please help. I am confused. I have included pictures.




Thanks. I dont want to muck it up. In the meantime, i am googling the wiring diagram. Thanks.
The plugs I bought have both same color wires, i am sure the polarity matters. How do i wire them so the the fans pulls?

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Old Sep 9, 2025 | 09:15 PM
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I hope this is correct

Last edited by prochargedz; Sep 9, 2025 at 09:17 PM. Reason: Error
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Old Sep 10, 2025 | 07:58 AM
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Since someone hacked up your wiring I would take your car to an auto electric specialist in your area since you are a little unsure of your electrical abilities and let them handle this…good luck !!

Last edited by C5 Diag; Sep 10, 2025 at 08:37 AM.
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Old Sep 10, 2025 | 09:24 AM
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If it were mine, I'd plug the fans in without hooking them to the car wiring ,test them across a battery and mark the all black wiring for correct rotation + & - . Sounds like they just had jumpered the left and right fan relay outputs toghether to run that single fan making sure it ran.
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